Stock inlet method and apparatus

ABSTRACT

THE METHOD AND APPARATUS FOR APPLYING HIGH FREQUENCY VIBRATIONS ON THE SLICE LIPS OF A PAPER MACHINE FOR EXAMPLE SO AS TO OBTAIN IMPROVED SMOOTH FLOW OF THE PAPER STOCK FROM THE SLICE. THE VIBRATION MAY BE APPLIED DIRECTLY TO THE LIPS TO MOVE THEM OR VIBRATION OF THE LIPS MAY BE INDUCED BY DRIVING THE LIQUID THROUGH THE LIPS AT THE RESONANT FREQUENCY OF THE LIPS.

June 1, 1971 s. M. SALOMON STOCK, INLET METHOD AND APPARATUS Filed April8, 1968 IIIlI/llI/l/[l/II/ lax w! Patented June 1, 1971 ice 3,582,465STOCK INLET METHOD AND APPARATUS Salomon M. Salomon, Beloit, Wis.,assignor to Beloit Corporation, Beloit, Wis. Filed Apr. 8, 1968, Ser.No. 719,476 Int. Cl. DZlf 1/02 U.S. Cl. 162-212 7 Claims ABSTRACT OF THEDISCLOSURE The method and apparatus for applying high frequencyvibrations on the slice lips of a paper machine for example so as toobtain improved smooth flow of the paper stock from the slice. Thevibration may be applied directly to the lips to move them or vibrationof the lips may be induced by driving the liquid through the lips at theresonant frequency of the lips.

BACKGROUND OF THE INVENTION Field of the invention This inventionrelates in general to paper machines and in particular to the slice lipof a papermaking machine.

Description of the prior art Paper machines comprise a pressure head boxand with an output slice formed with lips which allow the stock to flowfrom the head box into the papermaking machine. At times the stock tendsto clog or flow unevenly from the lips of the paper machine which canresult in variations in thickness and strength of the manufacturedpaper.

SUMMARY OF THE INVENTION The present invention comprises a head box of apaper machine for example which has slice lips to which the method ofusing a high frequency vibration is applied to improve the flow andoperation of the slice lips. The vibration may be applied to the lips bydirectly forcing the lips to vibrate with a high frequency vibrationgenerator or alternatively by inducing vibration of the lips by causingpulsations in the paper stock passing the lips. Pulsation in the paperstock at the resonant frequency of the lips will cause the lips tovibrate and thus result in the improved operation of the paper machine.The method of improved flow from a head box of a paper machine by movingthe lips of the slice is disclosed.

Other objects, features and advantages of the present invention will bereadily apparent from the following detailed description of certainpreferred embodiments thereof taken in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial diagrammatic viewof a paper machine showing the head box and slice lips with theinvention for vibrating the slice lips installed therein; and

FIG. 2 is a diagrammatic view of an additional method and apparatus forvibrating the slice lips of a paper machine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiments illustratedin FIGS. 1 and 2 of the paper machine a fragment of the forming endportion of the paper machine is illustrated and includes a head box 10which has an inlet conduit 11 and includes an agitator roller 12 mountedwithin the head box and driven by suitable driving means (not shown) toagitate the paper stock. An output slice is formed from lips 13 and 14which extend from the lower portion of the head box 10 and the paperstock passes through the slice lips 13 and 14 on to a Fourdrinier wire16 which passes over a breast roll 17.

The present invention relates to the method and apparatus for vibratingthe lips 13 and 14 so as to obtain a smooth and uniform flow from thehead box onto the papermaking machine. As shown in FIG. 1 a suitablevibrator generator 18 is mounted by a bracket 19 to the wall of the headbox 10 and has an output coupling 21 which is connected by bracket 22 tothe lip 13 to vibrate the lip. The vibrating driving means 18 might, forexample, be a permeability tuned oscillator which may be adjusted over afrequency range by an output shaft 23 which carries a knob 24. Theoutput of the oscillator 18 is converted into mechanical energy anddrives the shaft 21 so as to cause the lips 13 and 14 to vibrate. Theresonant frequency of the lips 13 and 14 can be determined by varyingthe output of the oscillator 18 until noticeable vibration occurs in thelips 13 and 14. At this frequency improved flow of the paper stock willoccur from the head box onto the Fourdrinier wire 16.

FIG. 2 illustrates a modification of the invention wherein anelectro-mechanical transducer 26 is mounted in the head box on thebottom wall 27 or in another suitable location and is electricallyconnected by leads 28 and 29 to a suitable oscillator 31 which has anoutput shaft 32 that carries a tuning knob 33. The transducer 26 may be,for example, of the type utilized in sonar or other underwatertransponders.

The output end 34 of the transponder is placed so as to face the lips 13and 14 so that the paper stock on the side facing the lips 13 and 14will be subjected to a pulsation caused by the output of the transducer26. Such pulsations will act upon the lips 13 and 14 and when at theresonant frequency of the lips 13 and 14 will cause them to havesubstantial movement. This point may be obtained by varying thefrequency of the oscillator 31 with the knob 33 until movement isobserved of the lips 13 and 14.

It is seen that this invention comprises apparatus and the method forinducing high frequency vibrations in the lips of a slice so as toobtain improved fiow past the lips.

The principles of the invention explained in connection with thespecific exemplifications thereon will suggest many other applicationsand modifications of the same. It is accordingly desired that inconstruing the breadth of the appended claims they shall not be limitedto the specific details shown and described in connection with theexemplification thereof.

I claim in my invention:

1. A papermaking machine having a head box and a pair of slice lipsextending therefrom, actuating means coupled to at least one of saidslice lips to drive it at substantially the resonant frequency of thelips so that the entire surface of the lips move to improve the flowthrough the lips.

2. A papermaking machine according to claim 1 wherein said actuatingmeans comprises an oscillator mechanically coupled to said lips.

3. A papermaking machine according to claim 2 wherein said oscillatorhas an output transducer, and the output transducer connected to saidlips.

4. A paper machine according to claim 3 wherein said output transduceris attached to said oscillator and a linkage extends from the transducerto the lips.

5. A papermaking machine according to claim 1 wherein said actuatingmeans comprises a transducer mounted in the headbox with its outputdirected toward said slice lips so as to pulsate said slice lips attheir resonant 3 4 frequency so that the slice lips vibrate throughouttheir References Cited total Surface UNITED STATES PATENTS 6. Apapermaking machine according to claim 5 where- 2,550,776 5/1951 Clem162 341 in the output of said transducer is adjacent the input flow 53,103,463 9/ 1963 Justus 162-341 point to said lips to pulsate theliquid between said lips. 3,325,348 6/1967 Bennett 162-341X th h 7 Themethd 9 Improving e fiowt mufgh the SIM REUBEN FRIEDMAN, PrimaryExaminer lips of a papermaklng machine so that they vibrate along theircomplete surfaces at their resonant frequency by GRANGER AsslstantExammer directly energizing their lips so that they vibrate at said 10CL resonant frequency. 162-347

